Why do you have to justify it? As long as its pareto efficient, i.e., I get more utility by paying more, it's not irrational. Every person makes their own judgment regarding utility vs. price. Paying $100 for nice jeans makes sense to me. Of course it doesn't make sense to most people. But both our decisions are equally justifiable, in a purely economic sense.
For example, I would never purchase an expensive luxury car. But to a lot of people, it makes sense to have all...

I started going out to clubs a lot last year. At first, I just wore the shirts I wore during during the day with black dress pants and fairly sleek black dress shoes, but not so nice that I wasn't afraid to have someone throw-up all over them. The people I went out with (2 girls and another guy...fellow graduate students) didn't comment when we went out, but I completely felt like a duck out of water. Partly because I have no idea what I was doing out on the dance...